The LS 603 uses a three-stage mesh filter at the base. Rotate the central cylinder counter-clockwise to remove it. Clean this weekly to prevent odors and drainage issues.
Ensure the Rinse Aid dispenser isn't empty. Legacy Ariston models rely heavily on rinse aid for effective "residual heat" drying. ariston ls 603 dishwasher user manual
is mandatory for water hardness above 9°dH (German degrees). The manual includes a test strip to determine local hardness and a table mapping hardness levels to a salt setting (usually 1–4 on a rotary switch inside the salt reservoir). The reservoir holds about 1.5 kg of coarse salt; the manual emphasizes using only dishwasher-specific salt (sodium chloride with no additives). After filling, water overflow is normal, and the “salt low” indicator may stay on until the next cycle completes. The LS 603 uses a three-stage mesh filter at the base